Foxconn's million+ workers do theoretically have a union, but only since 2007, and with actually elected leaders only since 2013. At that time they still faced the issue that most workers didn't know they were meant to elect a union representative at all and the union committee leaders were all managers. What little workers rights exist come mostly due to pressure from Apple and American unions.

And of course, as China is getting richer and the workers are starting to slowly come to resemble western workforces, companies are relocating to Vietnam.